Allowance for Credit Losses on Loans (Narrative) (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Adoption of Topic 326	[1]		$ 6,501
Accrued interest receivable on loans		$ 10,900		$ 11,000

[1] Adoption of the CECL accounting standard effective January 1, 2020.